OFFSET
0,3
FORMULA
a(n) ~ 2^(n + 1/2) * n^(n+1) / exp(n - 1/2). - Vaclav Kotesovec, Sep 16 2021
MATHEMATICA
Table[SeriesCoefficient[1/(1 + ContinuedFractionK[-k x, 1, {k, 1, n}])^n, {x, 0, n}], {n, 0, 20}]
Table[SeriesCoefficient[Sum[(2 k - 1)!! x^k, {k, 0, n}]^n, {x, 0, n}], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Oct 09 2017
STATUS
approved